How the Gas Industry Unsafe Situations Procedure sorts a defect into Immediately Dangerous, At Risk or Not to Current Standards, and the action each one needs.
The flow starts when an unsafe situation is found during gas work, then classifies its severity under the Gas Industry Unsafe Situations Procedure (GIUSP).
If the defect is a danger to life or property right now, it is Immediately Dangerous (ID). With permission you make it safe or disconnect it, attach an ID label, issue a Warning Notice, and, if permission is refused, advise the user and contact the gas emergency service.
If a fault could become dangerous but is not an immediate danger, it is At Risk (AR). With permission you turn off the appliance, attach an AR label and issue a Warning Notice, advising that it should not be used until the fault is put right.
If the installation is safe to use now but does not meet current standards, it is Not to Current Standards (NCS). You record it on the paperwork and inform the customer; the appliance may remain in use.
A theme running across all three outcomes is consent: turning off or disconnecting an appliance needs the customer permission, which is why the refusal route exists for ID situations.
The colours mirror the severity, so the diagram can be used to rehearse the decision quickly: danger now, could be a danger, or below current standards.
Use this for the decision principle. Always work to the current GIUSP and gas regulations, as classifications and required actions can change.